Drafting-machine.



C. H. LITTLE.

DRAFTING MACHINE.

APPLICATION FILED DEC. 12. 1908.

Patented Dec. 12, 1916.

4 SHEETS-SHEET I.

J1 L3 135 a? 1 M J5 I 135 C. H. LITTLE.

DRAFTING MACHINE.

APPLICATION FILED DEC.12, 190a.

Patented Dec. 12,- 1916.

4 SHEETSSHEET 2- m: NDRR'S PETERS co.. PMOTO-LITHO WAsNlNnmN n r:

C. H. LITTLE.

DRAFTING MACHINE.

APPLICATION FILED DEC. 12, 1908.

' Patented Dec. 12, 1916.

4 SHEETS-SHEET 3| Patented Dec. 12, 1916.

4 SHEETSSHEET 4.

nrnn earners near or :1 bis.

CHARLES H. LITTLE, 0F CLEVELAND, OHIO.

DRAFTING-IVIAGHINE.

aoaseo.

Application filed December 12, 1908.

b alien/1.0m it may concern:

Be it known that 1, CHARLES H. LITTLE, citizen of the United States, andresident of Cleveland, county of Cuyahoga, State of Ohio, have inventedcertain new and useful Improvements in Drafting-Machines, of which thefollowing is a specification and which are illustrated in theaccompanying drawings, forming a part thereof.

The invention relates to machines for use on a drawing board, and whichcomprise a jointed arm for carrying the drafting instrument, usually aprotractor, certain features of the invention, however, relating to theprotractor Whether used in Connection with such jointed arm orotherwise.

The object of the invention is to improve machines of this character invarious features, as hereinafter pointed out, with view to securinggreater accuracy and a wider range of efliciency; the invention beingexemplified in the structure and parts thereof as hereinafter described,and as illustrated in the accompanying drawings, in which- Figure 1 is aplan view of one form of the machine as applied to a drawing board; Fig.2 is a detail plan view showing parts of the protractor included in Fig.1 but drawn to a larger scale; Fig. 3 is a sectional View on the line 33of Fig. 2; Figs. 1, 5, G, and 7 are sectional details of the protractor;Fig. 8 is a detail showing a modified form of pivot for attaching thejointed arm to the anchor; Fig. 9 is a detail plan view of the inner endof the jointed arm and the anchor block to which the same is attached;Fig. 10 is a detail section on the line 1010 of Fig. 9: Fig. 11 is asectional detail on the line 1111 of Fig. 1; Fig. 12 is a sectionaldetail on the line 1212 of Fig. 1; Fig. 13 is a plan view of a modifiedform of the machine as applied to a drawing board; Fig. 141 is a detailof the anchor block shown in Fig. 13; Fig. 15 is a sectional View on theline 1515 of Fig. 1; Fig. 16 is a diagram representing the maximum rangeof movement of the machine as illustrated in Fig. 13 in drawing arectangular figure; Fig. 17 is a detail showing the outer end of thejointed arm and the drawing instrument carried thereby, the protractorbeing provided with a special form of lock; Fig. 18 is a sectionaldetail of the protractor shown in Fig. 17,

Specification of Letters Patent.

Patented Dec. 12, 1916..

Serial No. 467,284.

and illustrating the special form of lock; Fig. 19 is a detail of thelocking bolt shown in Fig. 18. i

A drawing board of ordinary form is shown at 20. The drafting machine issecured to this board, in one form of construction, by an anchor plate21, attached to the board at its upper left-hand corner, the base of theplate extending transversely of the grain of the board. As boards areordinarily made, the grain is parallel with their upper and lower edges,and hence the base of the anchor plate extends along the side edge ofthe board and is fixed to the board by means of screws 22, 23, arrangedalong such side edge.

The instrument forming the subject of this specification is intended toproduce drawings with extreme accuracy. Tt has been found that in suchinstruments the distortion of the board, resulting from its absorptionof moisture, produces variations in the angular position of the drawingtools carried at the outer end of the jointed arm. The moisture entersmost freely at the ends of the board, the pores of the wood running withthe grain, and in damp weather the swelling of the wood results in awidening of the board adjacent its ends, so that the lines of the grainadjacent the upper and lower edges of the board become bowed out wardlytoward their ends. As these instruments have heretofore been made, theattachment to the board has been by securing means arranged parallelwith the upper edge of the board, that is to say, on substantially ahorizontal line. The distortion referred to has had the effect of soshifting this line that it becomes oblique.

By the arrangement of the securing means by which the anchor plate isattached to the board transversely to the grain thereof, the distortionof the latter does not affect the position of the plate; consequently itdoes not vary the angular position of the instrument carried at theouter end of the ma chine.

The anchor plate 21 is provided with a pair of upstanding lugs 24, 25,to which there is pivotally attached a plate 26, which constitutes theinner end of the inner armmember 27 of the machine. The plate 26 hasrearwardly-projecting lugs which are engaged with the lugs24, 25, one ofthem,

as 28, carrying a pivot, preferably integral with; the lug for'engaginga socket inthe lug 24, and the other,29, carrying-a screw 30, the innerend of which engages as a pivot.

a'socketinthe lug 25. The downward movem'entof the plate26 is limitedby: a setscrew 31 "set through the plate, the lower end thereof'bearingon the anchor plate 21. Preferably at least one of the pivots forsecuringthe plate 26 to the anchor takes 'the form shown in Fig. 8, theaperture in the'l'ug 29' for-receiving the pivot screw'30 beingcounterbored at its outer end, and a lock-nut 105 beingapplied to thescrew and 7 having its inner face tapered to enter the .counterbore,thereby providing a positive lock forthe screw against lateral movement.V

I The machine comprises a pair of armmembers 27, 32, pivotally united,and each having the form of a parallelogram. The

inner arm-member 27 comprises the parallel'bars 33, 34, pivoted at theirinner ends to the plate '26 and at theirouter ends to a member 35, hereshown as annular in form and'constituting one'side of the parallelogram,the pivots 36,37, uniting. it with the l bars 33, '34, being arranged ona line parallel with the line of the pivots '38, 39, uniting these barswiththe plate 26. The outer arm member 32 comprises the parallel bars40,41, pivoted at 42, 43, to themeinber 3.5, the line of these pivotsbeing transverse to the'line of. the pivots 36, 37. The'outer ends ofthe bars 40, 41, are pivoted at 44.

45, to a plate. 46, the line of the latter pivots being parallel withthe line of the pivots 42, 43 To the plate 46 there is attached adrafting instrument, here shown as a protractor 47, carrying the rulers48, 49, which are in perpendicular relation to each other. I

The general descriptionof the drafting machine thus far given, except astothe from play, other than the true pivotal action,

permit the necessary freedom and ease of movement. Indeed, heretoforethere has always been present either sufiicient play to prevent accuracyon the drafting board, or

' thefriction has produced a drag or distortion of the machinevvith asimilar result,

and which has rendered it impossible to quickly move the instrument toa. definite position. In thepresent machine the various pivots of thejointed arm take the form of ball bearings, as illustrated'indetail inof the jointed arm and also the form used at the outer end of the outermember Referring to the portion of F ig. 11 shown in, cross-section, andrepresenting the joint 37, it will be seen that there is a post 50,fixed in the member 35 and threaded to receive various elements of thejoint. These elements comprise a centering block 51 in the form of atruncated cone, and which is first applied to the post 50 and turneddown tightly upon the face of the member 35; and a plate 52, which formsone of the cones of the ball bearing and is next applied to the post,its lower face being recessed to fit upon the centering block 51. Bythis construction greater accuracy is secured than is possible whendependence is placed upon the threaded engagement of the cone with thepost for centering the former. The outer cone 53'is also in threadedengagementwith the post 50, and a lock nut 54 bears upon its upper 'faceand holds itagainst displacement.

The balls 55 are seated upon the faces of the cones 52, 53, and within aV-shapcd channel formed in the head 56 of the bar 34. In assembling theparts, the cone 52 having been properly seated the head 56 is applied,the balls inserted, and the cone 53 is then turned down upon the post 50until the balls are firmly gripped by the several members, theengagementbeing sufiiciently tight to hold the arm members against movementtransverse to the axis of the pivot.

The joints36, 42, 43, 44 and 45 are identicalin construction with theoint 37, which has been described in detail. The joints 38, 39, one ofwhich is illustrated in detail in Fig. 10, differ from the joint alreadydescribed only in that the inner cone 57 is preferably a forced fit uponthe post instead of being in threaded engagement therewith, and one orboth of these joints is provided with a post the outer end, 58, of whichis eccentric to the body portion 59, which is set tightly through theplate 26 but may be turned by the application of a wrench to itspolygonal head 60, for the purpose of accurately positioning the severalmembers of the arm 27. In adjusting these joints, also,

the outer cone is set down tightly upon the balls in orderthat all playother than the pivotal action may be entirely eliminated.

The body portions of'the bars 33, 34, 40 and 41 are tubular, and areflattened, as shown in Fig. l5,'their major diameters being in theplanes of movement about the ball bearing joints, thereby providing forflexure in a direction perpendicular to these planes. Their ends orheads, as 56, 61, are solid and are welded to the body portions. Byreason of this construction and the location of the ball races withinthe heads of the bars, the strains are transmitted directly in line withthe latter.

In Figs. 13 and 14 there is shown a modified form of anchor. Instead ofthe simple block 21 located in the upper left-hand corner of the board,there is employed a base block 62, shown as secured to the under side ofthe board 20, and adjacent its upper right-hand corner by means ofscrews 63, 64, arranged transversely of the grain of the board, as inthe other form of construction, one of the screw holes preferably beingelongated to permit slight movement due to the expansion and contractionof the board. From this block 62 an arm 65 projects along the upper edgeof the board, as shown to a point somewhat beyond the middle thereof,this arm being offset upwardly, as shown at 66, to provide clearance forthe drafting instruments when it is desired to use them over the upperrighthand portion of the board. In this instance also the pivotssecuring the member 26 of the jointed arm to the anchor are arranged ona line oblique to the edges of the board, and the two members 67, 68, ofthe jointed arm are of unequal length, the outer arm 68 being theshorter. By this arrangement and proportioning of the parts the draftinginstruments carried by the jointed arm may be moved over substantiallythe entire surface of the board without extending mate rially beyond itsside edge, thereby effectingan economy of room space in that it isusually more convenient to locate the drawing board to give clearanceabove it instead of at its side.

The rectangular field covered by the drafting instrument, as illustratedin Fig. 16, is much larger than has heretofore been within the range ofmachines of this type, while the clearance required to the left of thisfield is limited to the distance from the outer end of the jointed armto the zero mark of the scale of the straight edges carried thereby. Theclearance for the machine is almost wholly above the field of operation,a consideration of great importance in drafting rooms.

The protractor 47 is of novel construction and is illustrated in detailin Figs. 2 to 7 It is secured to the outer cross-member 46 of the arm 32or 68 by means of a pair of clamping plates 69, 70, between which themember 16 is received, the three members being firmly secured togetherby means of screw-bolts 71, 72. The protractor comprises an annularscaled plate 73 and a circular center plate 74 fitted therein. Theannular plate 73 fits between the plates 69, 70, and has formed on itslower face adjacent its outer edge a shoulder 75, engaging acomplementary shoulder 7 6 formed on the upper face of the plate 69. Ashoulder 77, formed on the upper face of the plate 7 3 adjacent itsouter edge, engages the edge of the plate 70. This construction, whileproviding for the secure mounting of the plate 73, permits its rotationbetween the plates 69 and 70. A pair of studs 78, 79, set in the plate69, project upwardly through the plate 70, and carry at their upper endswing nuts 80, 81, by means of which the two plates may be drawn togetherfor the purpose of firmly clamping the plate 7 3 to lock it in theposition to which it may be adjusted. The wing nuts 80 and 81 are ofspecial construction, as shown in Figs. 2, 3 and 6, the last two figuresshowing the application of a similar nut in a diflerent part of thedevice. These nuts comprise a body portion to which the numeral 88 inFig. 6 is tied by a lead line and a strap, to which the numerals 80 and81 are applied in Fig. 2, this strap being looped around the body andadjustably clamped thereto by means of a screw 150, as shown in Figs. 2and 3.

The center plate 74 of the protractor is in rotatable engagement withthe plate 73, being seated in an annular rabbet 82, formed in the upperface of the latter adjacent its inner edge. The two plates are heldagainst disengagement by an annularly arranged se ries of clips 83applied to the under face of the plate 7 1, and projecting beyond theinner edge of the plate 7 3, these clips, except one of them, beingsecured by means of screws 8% setting through the plate 7 4 from above,their heads bearing upon spring washers 85. One of the clips, designated86, carries a stud 87 which projects upwardly through the plate 7 1 andcarries at its upper end a wing nut 88, by means of which the plates 73,74:, may be locked together.

A pair of chuck plates 89, 90, are rigidly secured to the under face ofthe plate 7 1, one perpendicular to the other. Each of these plates isformed. with a longitudinal recess opening through its outer end andhaving its side walls undercut, as shown at 91, Fig. 12. Rulers 92, 93,are fitted to these chuck plates, each carrying chuck-engaging plates94, 95, one adjacent each end, complementary to the chucking recesses. Aknob 96 is firmly secured to the upper face of the plate 74, and servesas means for controlling the instrument. A foot 97 is secured to thelower face of the plate 74, and has its sole rounded that it may freelyslide over the surface of the drawing paper.

The plate 73 has an annular graduated scale 98 marked upon its upperface, adja cent its inner edge, and registering 360 degrees. A referencepoint 99 is fixed to the plate 70 and cooperates with the scale 98. Avernier 100 is marked on the plate 7 1 and also coope ates with thescale 98.

The protractor here shown and described is of special value inconnection with surveyors work, providing for plotting Withoutcomputations, the operators field notes being required only to recordangles and measurements, the drafting instrument enabling him totransfer his work to paper by merely setting the scales of theinstrument to record the angles determined by his transit. It will beunderstood that the drafting machine may be equipped with any otherstyle of protractor, or other drafting tool.

The jointed arm is adjustably supported above the board by the'screw 31,resting upon the anchor block, and the bars are capable of sufficientflexure transverse to the plane in which they swing to permit the userto hold the drafting instrument firmly to the board, but aresulficiently elastic to immediately raise it therefrom when the downwardpressure is released. The joints of the arm move pivotally with suchfreedomthat the element of friction is substantially eliminated and theconsequent drag, which in instruments of this character results in someslight angular deviation of the straight edges, is entirely avoided. Thejoints being set up tight, entirely eliminate lost motion and insuregreater accuracy than it has been possible to obtain by any otherform'of pivot. In instruments of this character it has heretofore beenproposed to unite the two parallelograms forming the jointed arm bypivots common to each, and it has also been proposed to arrange thepivots of the two parallelograms on' lines perpendicular to each other.As'illustrated in Fig. 13, these pivots, there designated by thenumerals 101, 102, and 103, 104:, the one pair belonging to thearm 67and the other pair to the arm 68, are arranged" upon lines which-areoblique to each other. 'This dis position of the pivots provides for afree range of movement of the drafting instrument over the board, whilereducing the movement requlred of the inner 'member of the ointed arm,thereby still farther V economi'zing the space required beyond the edgeof the board. 7 V 1 In Figs. 17 18 and 10' there is shown in detail aform of stop which may be used in connection with the protractor.Referring to Fig. 18, the upper plate of theprotractor is represented at106 and its lower plate at 107. At'108 is shown achuck-arm for carryingone of the rulers, this chuck-arm beingcarried' by the plate'106. Aconicalbushing 109' is seated within an aperture of complementary formin the members 106, 108.

This bushing has an 'upwardlyprojecting threaded stern 110, and iscentrally apertured and longitudinally split. A nut 111, running uponthe stem 110, bears against the upper face of the plate 100 and drawsthe conical portion of the bushing firmly to its seat, the split in thebushing facilitating its seating by permitting its compression. A post112 extends through the longitudinal aperture of the bushing and entersa suitable socket in the plate 107.

The stem 110 is recessed at its outer end, this recess preferably havingflaring walls and one of such walls being provided with a notch 113. Anarm 1M projects laterally from the post 112 and cooperates with therecess in the outer end of the stem 110. This arm preferably carries ananti-friction roller 115 for engaging the walls of the recess. A spring116, secured to the plate 100 bears upon the upper end of the post 112to force it into engagement with the socket in the plate 107. The postis raised against the pressure of the spring 116 by lateral pressureupon the arm 11 1-, causing it to ride up one of the walls of the recessin the stem 110, and may be held in its upper position by engaging thearm with the notch 118.

In machines of this type when used on so-called'vertical boards acounter-poise is necessary. In Fig. 13 such a device is shown, andcomprises helical springs 110 reacting between the anchor plate (35 andthe member 67, and springs 11'? reacting between the member 67 and theouter end of the outer member of the jointed arm. To avoid the fallingof the instrument should one of the springs break, there is provided aplurality of springs in each instance. The set of springs 11? is alsoattached to crossbars which in turn are secured to the members 101 and68, and in order to keep the line of strain outside of the parallelogramthe attachment to the member 101 is through, the medium of an arm 123projecting from such member.

I claim as my invention 1. Ina drafting machine, a jointed arm,

theconnection between the sections of the arm comprising ball bearings,the shells of such bearings securely clamping the balls thereof againstlost motion.

] 2. In a drafting machine, in combination, an anchor plate, an armswingingly mounted upon the plate, the connection between the pair ofcircular plates mounted on the post and having their marginal. portionsinclined away each from the other, an arm having an eye the Wall ofWhich is circumferentially channeled and Which encircles the post, sucharm being located between the circular plates, and balls seated betweenthe marginal portions of the circular plates and within the channel ofthe Wall of the eye of the arm, the circular plates being securelyclamped upon the balls to prevent lost motion.

In a drafting machine, in combination, a ointed arm comprising twomembers, one hereof having an eye the Wall of which is formed With anannular channel, a post fixed in the other member of the arm and projecting through the eye, a conical centering block on the post, a conefitted to the post and having a recess for engaging the centering block,a second cone mounted on. the post, and a set of balls fitted in thechannel and engaging the cones.

6. In a drafting machine, in combination, a jointed arm comprising tWomembers, one thereof having an eye the Wall of Which is formed With anannular channel, a post fixed in the other member of the arm andprojecting through the eye, a centering block on the post, a cone fittedto the post and having arecess for engaging the centering block, asecond cone mounted on the post, and a setof balls fitted Within thechannel and en gaging the cones, the cones engaging the balls to preventall movement except rotation thereof.

7. In a drafting machine, in combination, a jointed arm comprising tWomembers, one thereof having an eye, the Wall of which is formed With anannular channel, a post in the other member of the arm and projectingthrough the eye, a centering block on the post, a cone in threadedengagement with the post and having a recess for engaging the centeringblock, a second cone mounted on the post, and a set of balls fittedWithin the channel and engaging the cones.

8. In a drafting machine, in combination, an anchored plate, aleafpivoted to the plate, a pair of parallel bars pivoted to and overhangingthe leaf, a cross member pivotally attached to the outer ends of thebars, a second pair of parallel bars pivotally attached to the crossmember, a second cross member pivotally attached to the outer ends ofthe second pair of bars, all of the pivots of the two sets of barshaving ball bearings, the balls thereof being securely clamped againstlost motion, and a drafting instrument carried by the second-named crossmember.

9. In a drafting machine, in combination, an anchored plate, a leafpivoted to the plate, a pair of parallel bars pivoted to and overhangingthe leaf, a cross member pivotally attached to the outer ends of thebars,

a second pair of parallel bars pivotally attached to the cross member, asecond cross member pivotally attached to the outer ends of the secondpair of bars, all of the pivots of the two sets of bars having ballbearings, means for limiting the movement of the balls to rotation, anda drafting instrument carried by the second-named cross member.

10. In a drafting machine, in combination, a drafting board, an anchorblock secured to the board remote from one end thereof and having an armextending along one edge of the board and being offset above the surfacethereof, a jointed arm pivotally attached to the end of the arm of theanchor block, and a drafting instrument carried at the outer end of thejointed arm.

11, In a drafting machine, in combination, an anchor plate, a jointedarm pivoted on the plate, and a protractor carried at the outer end ofthe arm and comprising a base plate, a scaled rotatable annular platemounted on the base plate, an independently rotatable circular platefitting Within the annular plate, and a ruler fixed to the circularplate.

12. In a drafting machine, in combination, an anchor plate, a jointedarm pivoted on the plate, and a protractor carried at the outer end ofthe arm and comprising a base plate, a scaled rotatable annular platemounted on the base plate, an independently rotatable circular platefitting Within the annular plate, means for locking the annular plate tothe base plate, means for locking the two movable plates together, and aruler fixed to the circular plate.

13. In a drafting machine, in combination, a base, a scaled annulusmounted on the base and oscillatable about its own axis, an oscilla ablecircular plate fitted within the aperture of the annulus and carrying avernier cooperating with the scale of the annulus, and a ruler carriedby the circular plate.

14. In a drafting machine, in combination, a base, a scaled annulusoscillatably mounted on the base and oscillatable about its own axis, anoscillatable circular plate fitted Within the aperture of the annulusand carrying a Vernier cooperating with the scale of the annulus, aruler carried by the circular plate, means for locking the annulus tothe base, and means for locking the circular plate to the annulus.

15. In a drafting machine, in combination, a base, a scaled annulusoscillatably mounted on the base and oscillatable about its own axis, anoscillatable circular plate fitted within the aperture of the annulusand carrying a Vernier cooperating With the scale of the annulus, aruler carried by the circular plate, and means for locking the annulusto the base comprising a post, a nut in threaded engagement With thepost, and

a Controlling wing adjustably fixed to the 16. In a drafting machine, incombination, a base, a scaled annulus oscillatably mounted on the base,an oscillatable circular plate fitted within the aperture of the annulusand carrying a Vernier cooperating V with the scale of the annulus, aruler carried by "the circular plate, and means for locking the annulusto the base comprlsing a'post, a nut in threaded engagement wlth thepost, and arcontrolling wing folded around the nut and a screw securingthe two ends of the wing together and binding its fold to the nut.

17. In a drafting instrument, in combination, scaled members in slidingengagefment, a clamping device for locking such members together andcomprising a threaded post, a nut enga ing the post, and a controlhngwlng folded around the nut, and a screw securing the two ends of thewing to- V 7 ing surface, a jointed arm comprising two sections and anelbow member, each section comprising apair of parallel bars of equallength, the bars of the inner section being plvotally secured to theanchor arm, a draftmg instrument carried at the" outer end of thejointed arm, the anchor arm being 10- oated remote from the ends of theboard and the llnes olnmg the axes of the pivots connecting the barsof'the inner section of the arm to the anchor arm being oblique to theedges of the board and the alinement of the pivots of adjacent ends ofthe sections of the jointed arm intersecting each other obliquely,

20. In a draftin machine in combination, a board, an anchor arm securedto the board below and extending above thedrawing surface, a jointed armcomprising two sections, each section comprising a pair ofparallelbars'ofequal length, the bars of the 7 inner section'of thearm'being pivotally se- Copies ofthis patent maybe obtained for sured tothe anchor arm, drafting instrument carried at the outer end of thejointed arm, the anchor arm being located remote fromvthe ends of theboard, and'the line joining the axes of the pivots connecting the barsof the inner section of the arm to the anchor arm being oblique to theedges of the board, and the lines joining the axes of the pivots ofadjacent ends of the two sections of the arm being relativelytransverse, the inner section of the jointed arm being longer than theouter section.

21. In a drafting instrument, in combination, a board, an anchor armsecured to the board below and extending above the drawing surface, ajointed arm comprising two sections, each section comprising a pair ofparallel bars of equal length, the bars of the inner section of the armbeing pivotally secured to the anchor arm, a drafting instrument carriedat the outer end of the jointed arm, the anchor arm being located remotefrom the ends of the board, and the lines joining the axes of the pivotsconnecting the bars of the inner section of the arm to the anchor armbeing oblique to the edges of the board, and the lines joining the axesof the pivots of adjacent ends of the two sections of the arm beingrelatively oblique, the inner section of the jointed arm being longerthan the outer section.

22. In a drafting machine, in combination, an anchor, an arm, pivotsconnecting the arm to the anchor, one of the pivots comprising ascrew-bolt in threaded engagement with one of the united members, theouter end of the bolt-receiving aperture being counterbored, and atapering lock nut running on the bolt and fitting within thecounterbore.

23. In a drafting machine, in combination, a board, an anchor comprisinga base adapted for attachment to the board and an upstanding andlaterally projecting arm, a jointed arm pivotally secured to the arm ofthe anchor, and a straight edge carried by the arm and movable under thearm of the anchor.

24. In a protractor, in combination, three plates having concentriccurved edges of different radii, the outer plate being nonrotatable andcarrying a reference point, the intermediate plate being annular and theintermediate and inner plates being independently rotatable and onethereof being graduated.

CHARLES H. LITTLE.

Witnesses J. GoLDBnRenR, E. B. SLAUsoN.

five cents each, by addressing the .Commissioner of Patents. Washington,D. 0.

